Plot: Cara (Moore) is a psychiatrist like her father (DeMunn). He introduces her to one of her patients and it soon emerges that Adam (Rhys Meyers) has multiple personalities.

One minute he’s shy David, stuck in a wheelchair. The next he’s walking about and much more aggressive as Adam, then Wes appears.

Cara is convinced he’s putting it on, that Adam is the real man and David is “pure invention”. Especially when she discovers that the real David is dead, brutally murdered by Satan-worshipping mountain witches. But how can he know things only David could?

Then people she knows start dying in a rather horrible way.

Good points: The cast is good. This is a well-made, well-acted film – it’s just a shame the other parts of it aren’t up to scratch. A menacing atmosphere is built up in the intriguing, if slow, first half of the film and there are a couple of scares, especially when Adam transforms himself for the first time by bizarrely bending his neck right back.

Bad points: We know that Cara’s husband was brutally killed in front of her but we get very little sense of her personality or how this has affected her. Moore is a great, Oscar-nominated actress and should be making better choices than this.

There are far too many loud noises in a bid to make us jump, rather than genuinely frightening moments, though you may be jolted out of your seat a couple of times.

As we get into the supernatural realms of witch doctors, the whole thing became far too silly for me and I began to lose interest. The ending is more laughable than chilling.

Should I see it?: Maybe, if you’re a fan of horror thrillers, but don’t expect too much.